In python, you can use ctype (dl is deprecated now) to load dynamic link library. In 10.4 and 10.5 it may work fine, but it may occur errors in 10.6, such as

/Library/Frameworks/dummy.framework/dummy: no matching architecture in universal wrapper

Since the python in Snow Leopard is 64-bit in default, for those libraries which does not support 64-bit. You can test your library by

% file /Library/Frameworks/dummy.framework/Versions/Current/dummy

If you library is i386 only, you may need to handle it in this way.

% export VERSIONER_PYTHON_PREFER_32_BIT=yes
% python your_script.py

ericsk has also mentioned this for wxPython in his plurk

For more information, you can read the man page in your Snow Leopard.